1220726829 has 32 divisors (see below), whose sum is σ = 1913497600. Its totient is φ = 677616192.

The previous prime is 1220726827. The next prime is 1220726831. The reversal of 1220726829 is 9286270221.

It is an interprime number because it is at equal distance from previous prime (1220726827) and next prime (1220726831).

It is not a de Polignac number, because 1220726829 - 2¹ = 1220726827 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220726827) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 871872 + ... + 873270.

It is an arithmetic number, because the mean of its divisors is an integer number (59796800).

Almost surely, 2^1220726829 is an apocalyptic number.

It is an amenable number.

1220726829 is a deficient number, since it is larger than the sum of its proper divisors (692770771).

1220726829 is a wasteful number, since it uses less digits than its factorization.

1220726829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2569.

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 1220726829 is about 34938.9013708216. The cubic root of 1220726829 is about 1068.7418843062.

The spelling of 1220726829 in words is "one billion, two hundred twenty million, seven hundred twenty-six thousand, eight hundred twenty-nine".